<template>
  <div>
     <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false">
      </el-alert>

      <!-- 选中商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled"
          @click="addDialogVisible=true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals"
                :key="i" closable @close="handleClose(i)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" 
                @click="showInput">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" 
                icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" 
                icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled"
          @click="addDialogVisible=true">添加属性</el-button>
           <!-- 静态属性表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand"></el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" 
                icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" 
                icon="el-icon-delete">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText" 
      :visible.sync="addDialogVisible"
      width="50%" @close="addDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="80px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
     <el-dialog
      :title="'修改' + titleText" 
      :visible.sync="editDialogVisible"
      width="50%" @close="editDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="80px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data(){
    return{
      //商品分类列表
      cateList:[],
      //级联选择框的配置对象
      cateProps:{
        value:'cate_id',
        label:'cate_name',
        children:'children'
      },
      //级联选择框双向绑定到的数组
      selectedCateKeys:[],
      //被激活的页签的名称
      activeName:'many',
      //动态参数数据
      manyTableData:[],
      //静态参数数据
      onlyTableData:[],
      //控制添加对话框的显示与隐藏
      addDialogVisible: false,
      //添加参数的表单数据对象
      addForm:{
        attr_name: ''
      },
      //添加表单的验证规则对象
      addFormRules: {
        attr_name :[{required: true,message: '请输入参数名称',trigger: 'blur'}]
      },
      //控制修改对话框的显示与隐藏
      editDialogVisible: false,
      //修改的表单数据对象
      editForm: {},
      //修改表单的验证规则对象
      editFormRules: {
        attr_name :[{required: true,message: '请输入参数名称',trigger: 'blur'}]
      },
      //控制按钮与文本框的切换显示
      inputVisible: false,
      //文本框中输入的内容
      inputValue: ''
    }
  },
  created(){
    this.getCateList()
  },
  methods:{
    //获取所有的商品分类列表
    async getCateList(){
      const {data:res} = await this.$http.get('categories')
      if(res.meta.status !== 200){
        return this.$message.error('获取商品分类失败!')
      }
      this.cateList = res.data
      console.log(this.cateList)
    },
    //级联选择框选中项变化，会触发这个函数
    handleChange(){
      this.getParamsData()
    },
    //tab页签点击事件的处理函数
    handleTabClick(){
      console.log(this.activeName)
      this.getParamsData()
    },
    //获取参数的列表数据
    async getParamsData(){
      //证明选中的不是三级分类
      if(this.selectedCateKeys.length !== 3){
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      //证明选中的是三级分类
      //根据所选分类的id，和当前所处的面板，获取对应的参数
      const {data:res} = await this.$http.get(`categories/${this,cateId}/attributes`,
        {params:{sel:this.activeName}
      })

      if(res.meta.status !== 200){
        return this.$message.error('获取数据失败！')
      }

      res.data.forEach(item =>{
        item.attr_vals = item.attr_vals ? item.attr_vals.split('') : []
        //控制文本框的显示与隐藏
        item.inputVisible = false
        //文本框输入的值
        item.inputValue = ''
      })
      console.log(res.data)
      if(this.activeName === 'many'){
        this.manyTableData = res.data
      }else{
        this.onlyTableData = res.data
      }
    },
    //监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFileds()
    },
    //点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => 
      {
        if (!valid) return
        const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if(res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    //点击按钮，展示修改的对话框
    async showEditDialog(attr_id) {
      //查询当前参数的信息
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
      {params: { attr_sel: this.activeName}
      })

      if(res.meta.status !== 200){
        return this.$message.error('获取参数失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    editDialogClosed() {
      this.$refs.editFromRef.resetFileds()
    },
    //点击按钮，修改参数形象
    editParams() {
      this.$refs.editFormRef.validate(async valid =>
      {
        if (!valid) return
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/$
        {this.editFrom.attr_id}`,{attr_name:this.editForm.attr_name,
        attr_sel:this.this.activeName})

        if(res.meta.status !== 200){
          return this.$message.error('获取参数失败！')
        }
        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    //根据Id删除对应的参数项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)

        if(confirmResult !== 'confirm') {
          return this.$message.info('已取消删除！')
        }
        //删除的业务逻辑
        const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/$
        {attr_id}`)

        if(res.meta.status !== 200) {
          return this.$message.error('删除参数失败！')
        }
        this.$message.success('删除参数成功！')
        this.getParamsData()
    },
    //文本框失去了焦点 或摁下了 enter键都会触发
    async handleInputConfirm(row) {
      if(row.inputValue.trim().length === 0){
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //如果没有return，则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      //需要发起请求，保存这次操作
      this.saveAttrVals(row)
    },
    //将对 attr_vals 的操作，保存到数据库
    async saveAttrVals(row) {
      //需要发起请求，保存这次操作
      const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name:row.attr_name,
        attr_sel:row.attr_sel,
        attr_vals:row.attr_vals.join(' ')
      })
      if(res.meta.status !== 200){
        return this.$message.error('修改参数项失败！')
      }

      this.$message,success('修改参数项成功！')
    },
    //点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true
      //让文本框自动获得焦点
      //$nextTick 方法的 作用，就是当页面上元素被重新渲染之后，
      //才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    //删除对应的参数可选项
    handleClose(i,row) {
      row.attr_vals.splice(i,1)
      this.saveAttrVals(row)
    }
  },
  computed:{
    //如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled(){
      if(this.selectedCateKeys.length !== 3){
        return true
      }
      return false
    },
    //当前选中的三级分类的Id
    cateId() {
      if(this.selectedCateKeys.length === 3){
        return this.selectedCateKeys[2]
      }
      return null
    },
    //动态计算标题的文本
    titleText() {
      if(this.activeName === 'many'){
        return '动态参数'
      }
      return '静态参数'
    }
  }
}
</script>

<style lang="less" scoped>
  .cat_opt{
    margin: 15px 0;
  }

  .el-tag {
    margin: 10px;
  }

  .input-new-tag {
    width: 120px;
  }
</style>